netarea upc Lab: Scaling Database Applications in .NET framework

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Lab: Scaling Database Applications
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In this lab, you will experiment with techniques used to scale out a database application. In the first exercise, you will create a partition function that is used to indicate how a partition is divided. In Exercise 2, you will create a SQLCLR user-defined function. The completed code examples, in both Visual Basic and C#, are available in the \Labs\ 08 folder on the companion CD.
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Lab requirements
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You will need to have SQL Server 2005 installed before you can complete this lab. Refer to the Introduction for setup instructions.
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Exercise 1: Create a Partition Function In this exercise, you will create a partition function that is used to horizontally partition the data in the Production.Product table. The data will be partitioned by ProductNumber, which is a character-based column. The data will be placed into separate filegroups that reside on the same instance of SQL Server. 1. Open Microsoft SQL Server Management Studio. 2. Connect to the instance of SQL Server 2005 that contains the AdventureWorks database. 3. Right-click the AdventureWorks database, and select Properties. Select the Filegroups page. (Refer to Figure 8-4.)
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Lesson 1: Scale Database Applications
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Figure 8-4 The Filegroups page as displayed in the Properties dialog box for the AdventureWorks database
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4. Click Add, and enter FG2 as the name of the new filegroup. Add another filegroup named FG3. 5. Select the Files page, and click Add to add a new file. The new file will be named AdventureWorks_Data_FG2, the File Type will be data, and the Filegroup will be FG2. Add another file named AdventureWorks_Data_FG3 with a File Type of data and the Filegroup FG3. When finished, click OK to save your changes to the database. 6. Select New Query. 7. Select AdventureWorks from the Available Databases drop-down list box. Add the following code to the query window:
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CREATE PARTITION FUNCTION pfnProduct (nvarchar(25)) AS RANGE LEFT FOR VALUES ('FL', 'LN')
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8. Click the Execute button, and ensure that the function is created successfully. 9. Replace the code added in step 7 with the following:
CREATE PARTITION SCHEME pscProduct AS PARTITION pfnProduct TO ('Primary', 'FG2', 'FG3')
10. Click the Execute button, and ensure that the scheme is created successfully.
8
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11. From Object Explorer, expand the Production.Product table, and then the indexes node within the AdventureWorks database. Right-click the AK_Product_ProductNumber index, and select Properties. 12. From the Properties dialog box, select the Storage page. Select the Partition scheme option, and ensure that the partition scheme named pscProduct is selected. (Refer to Figure 8-5.) Enter ProductNumber as the Table Column, and click OK to save the changes.
Figure 8-5 The Storage page for the AK_Product_ProductNumber index properties
13. Return to the new query window, and execute the following query:
select * from sys.partitions where object_name(object_id) = 'Product'
14. You should see results similar to those in the following table:
Partition ID Object ID Index ID Partition Hobt ID Number 1 1 1 1 1 2 3 72057594056998912 72057594057129984 72057594057195520 72057594057261056 Rows
72057594056867840 1429580131 1 72057594056998912 72057594057129984 72057594057195520 72057594057261056 1429580131 3 1429580131 17 1429580131 2 1429580131 2 72057594057064448 1429580131 4
72057594056867840 504 504 504 137 204 72057594057064448 504
72057594057326592 1429580131 2
72057594057326592 163
Lesson 1: Scale Database Applications
15. Notice that in this table, the last three rows are associated with our newly created partition. The table was partitioned into three groups of the following sizes: 137, 204, and 163. Exercise 2: Create a CLR User-Defined Function In this exercise, you will create a user-defined function using .NET Framework code. The code will be created using a Windows text-based editor and compiled using the Visual Basic or C# command line compiler. You will then create an assembly in SQL Server and execute the newly created user-defined function just as you would a user-defined function created with Transact-SQL.
BEST PRACTICES
For demonstration purposes only
For demonstration purposes, the user-defined function in this exercise performs a data access query. Generally, you will not use SQLCLR for basic data access. In this case, Transact-SQL is a better alternative.
1. Open SQL Server Management Studio. 2. Connect to the instance of SQL Server 2005 that contains the AdventureWorks database. 3. Select New Query. 4. Select AdventureWorks from the Available Databases drop-down list box. Add the following code to the query window:
sp_configure N'clr enabled', 1 GO RECONFIGURE GO SELECT * FROM sys.configurations WHERE [Name] = N'clr enabled'
5. Click the Execute button, and ensure that the query executed successfully. 6. Open Windows Notepad, and copy in either the C# or VB code shown below:
//C# using using using using using System; System.Data; Microsoft.SqlServer.Server; System.Data.SqlClient; System.Data.SqlTypes;
public class TK4428 { [Microsoft.SqlServer.Server.SqlFunction(DataAccess=DataAccessKind.Read, IsDeterministic=true)] public static Int32 GetProductID(String prodNumber)
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